You don't need to mind those "companies" you mentioned. They could be impacting the price a tiny bit because probably they're gonna buy in bulk as always as they're company not an individuals, but that shouldn't bother you.
Just invest when you have the coins.
Your hibernation in 2017 really did something, but you might have missed a bit that year because that was like one of the memorable ATH of BTC back then before it crashed.