Should I use Interactive Brokers even though I don’t have 100k USD?

I would say you should if:

1. You can reach the 100k mark within the next year or two

2. Youre still 25 or under and expect to hit 100k within a year or two from hitting 26

3. You trade often

I fall in categories 1 and 2 which is why I'm on IBKR haha. A good alternative I think would be Tiger Brokers if you want an interim broker before you make the jump eventually to IBKR when you have accumulated enough in your account.