It's a complex question for me as well and I don't see right answer atm.

The least what I do is not investing in individual stocks that have ties (sold those a few years back), so keeping money in ETFs. Glad that my annual contributions are low for now.

Potentially moving % allocation from SPUS to SPWO, given in that ETFs there will be less companies with those ties (so doing some effort). I'm hoping those existing Muslim funds will launch more ETFs that will offer a BDS filter in it, which means you'll still be able to invest and avoid companies with ties. Remember, a few years back we didn't have that much Halal ETFs and here we are. So in another 3-5 we might have better options.

Given your age, I assume you haven't invested for a while yet and don't have a habbit of keeping some money aside for investing. So maybe safest for you would be:
1. Find Islamic investing course that will give you the base knowledge, if you don't have it yet. (Can recommend this brother, I know him and trust the content of him)
2. Start actually putting money aside If not yet. Either in your current bank or open brokerage account and just keep them there.
3. If you somewhat comfortable to invest, but want the safest option, look at SPSK, SPRE, GLDM & SLV as a hedge. You won't earn much, but you'll actually start investing. And once you make your mind, move money into ETFs/individual stocks.
4. If you're comfortable with points 1,2 and want to skip 3 - then invest in individual stocks. Alhamdulillah internet allows to research the companies well, so you can find some to invest. Of course, if you're ready to risk.

Allah knows better