Hi @Dph and welcome to the forum. I am someone who these days only visits very occasionally. Tonight I found your post.
I am 58 and bisexual, these days celibate and in a companionship relationship with someone who used to be my lover in a straight relationship. We have been traveling life together for 17 years.
Loneliness is hard and I can totally understand how lockdown might make it seem worse. From what you said in your post, I sense there may have been something happen in the past that resulted in you withdrawing from close contact with people? It's good that you have a good work situation and feel popular and well liked there, so that at least your days are not spent completely alon.
I don't have any clear advice to give you about your feelings of loneliness now. But I suspect you may be suffering from not just loneliness, but also depression, since you are finding it hard to get through each day. Depression has been part of my bipolar since childhood. Finding the energy to get through days is very familiar to me indeed.
Do you have a GP or other support for this?