1. Welcome to the future. Halving already happened. Unless, of course, you mean the halving in 4 years and that the pandemic will still be here.
2. It seems obvious that at least for now, there has been no long-term effect of the pandemic or of halving on Bitcoin price. It's volatile but generally stable between $9k-$10k.
3. We'll have to wait until the pandemic is over to be able to assess its impact on global economy and Bitcoin. Since we're nowhere near the end of it all, it's probably premature to jump to conclusions.
4. We'll never know for sure whether the pandemic or halving affected the price significantly because there are always a bunch of other factors that could weigh in, and with time the number of these factors increases.