Recently I received some btc that took about 4 days, there is another transfer that was made May 7th, I have not gotten it yet!
You should read the news and specially the posts in this forum to better understand that why there is delay on network. I will simplify it for you by saying just because of BRC-20 protocol and its ordinals thing has caused the congestion of the network with its useless token Pepe and that created much burden on the blockchain and is the cause of huge fees and delays in transactions.
How can I find out the status / when I will receive it??!? I was told that the "slowdown" is due to
Like other reputed members of the forum suggested you can use a good block explorer to get an estimation about the time when you will receive the payment. The estimation might not be exact but still you will get some info that might be helpful to reduce your stress. You should use Blockchair to get the estimated time of your transaction as that one is the most recommended one because of its features.
higher transfer fees. Will these fees ever lower, and are BTC worth the investment still??!? (Layman Terms Please).
In layman terms yes the fees will be lower and the BTC is still worth the investment. The hype created by the ordinals won't be staying for a long time. And, it is expected that within few weeks the transaction speeds will be faster and the fees will be reduced just the way they were before the introduction of that useless token.