מי שיכול לטפל בבעיה הזאת עכשיו, יכול לעזור לי מאוד.

No. Here מי is not a question word.

The combination מי ש־ often means whoever, anyone who, or the person who depending on context.

So:

• מי יכול? = Who can? (a question)
• מי שיכול... = Whoever can... / Anyone who can... (not a question)

In this sentence, מי שיכול לטפל בבעיה הזאת עכשיו means whoever can deal with this problem now.

Because the sentence has two parts:

1. מי שיכול לטפל בבעיה הזאת עכשיו
   = whoever can deal with this problem now

2. יכול לעזור לי מאוד
   = can help me a lot

So the structure is basically:

Whoever can X, can Y.

The first יכול describes the person’s ability to handle the problem.
The second יכול gives the main point: that such a person can help me a lot.

In Hebrew, the present tense is often used for general or current ability, much like English can.

So יכול here means something like:

• is able to
• can

It sounds natural because the sentence is about a person’s ability right now.

Using יוכל would sound more specifically future-oriented, like will be able to, and would change the nuance.

Because לטפל is a verb that normally takes the preposition ב־.

So Hebrew says:

• לטפל בבעיה = to deal with the problem / handle the problem / treat the problem

This is just how the verb works. It does not usually take a direct object with את.

Many Hebrew verbs require a specific preposition, and this is one of them.

Because the preposition ב־ (in / with / on, depending on context) combines with the definite article ה־.

So:

• ב + הבעיה becomes בַּבעיה
• In normal unpointed spelling, that is written בבעיה

So even though you do not see a separate ה, the noun is still definite.

That is why בבעיה הזאת means with this problem / this problem, not with a problem.

Because in Hebrew, demonstratives like this usually come after the noun.

So:

• הבעיה הזאת = this problem
• literally: the problem this

That is the normal Hebrew pattern.

Also, הזאת must agree with the noun:

• בעיה is feminine singular
• so the demonstrative is הזאת

Because בעיה is a feminine noun.

In Hebrew, adjectives and demonstratives must agree with the noun in:

• gender
• number

So:

• masculine singular: הדבר הזה = this thing
• feminine singular: הבעיה הזאת = this problem

That is why you get הזאת, not הזה.

Because לעזור usually takes ל־ before the person being helped.

So Hebrew says:

• לעזור לי = help me
• לעזור לו = help him
• לעזור להם = help them

This is different from English, where help takes a direct object. In Hebrew, it works more like help to someone.

So אותי would not be the normal form here.

It modifies לטפל בבעיה הזאת.

So the meaning is:

whoever can deal with this problem now

The word עכשיו emphasizes urgency or immediacy. It tells us the needed help is needed at this moment, not just in general.

מאוד means very or a lot / very much, depending on context.

Here it means:

• יכול לעזור לי מאוד = can help me a lot / can help me very much

In Hebrew, מאוד often comes after what it modifies. So its position at the end is very natural.

Because Hebrew often uses the masculine singular as the default form when the person is unspecified.

So מי שיכול can mean whoever can in a general sense.

If you specifically meant a woman, you could say:

• מי שיכולה לטפל בבעיה הזאת עכשיו, יכולה לעזור לי מאוד.

But when the person is unknown or generic, masculine singular is very common.

It is very natural here, because the sentence begins with a fairly long clause:

מי שיכול לטפל בבעיה הזאת עכשיו

Then the main statement comes after it:

יכול לעזור לי מאוד

The comma helps the reader hear the break between the two parts. Even if punctuation practices vary a bit, the comma is helpful and normal in a sentence like this.