Why would you buy altcoins now, when BTC is still pumping and the altcoin season has not yet started?
Read again carefully my post above, I never said I buy altcoins now. I said "I bought some altcoins in the last few weeks".
If you assume BTC is still pumping, you need to check the fact. Don't you see BTC has dropped from $99,655 to $95,788? Are you sure it is still pumping?

Holding Bitcoin seems like a better idea, unless you think BTC has already reached its peak (or is very close), then fine.
Holding BTC is good, I'm also holding BTC. Have I ever said I sold my BTC for altcoins?

I also believe the peak of BTC price is probably above $100k.
And I think that December might be a bit too soon for the altcoin season. If I remember correctly, it took longer than that in the previous cycles.
If December is too soon, when you assume altcoins season will begin?

Each cycle may have a different pattern. I think it is not impossible if we have a faster altcoins season in this cycle due to some factors.