Is it too obvious and silly of me to suggest you find yourself a cat to love? (Especially an older one, whose owner has died)
Just having another heartbeat in the house, and an intelligent little face to draw your thoughts outwards and towards another living being! So good for the soul. (and for the cat)
Have you any outside space? Even a decent windowsill? Grow your own herbs, lettuce too. These too are living entities and there's an infectious energy there, quite apart from your spending time tending to your greenery.
Solitude, when it’s not sought deliberately as the preferred domestic setup, can still be an extremely positive way of life, as long as you reject all notions in your head that it’s a lesser option, in some way insufficient, etc.
If you can train your mind to revel in your independence and freedom, enthusiasm for pastimes you presently dismiss might flourish.
Reading is of course the great and wonderful indulgence available to those not beholden to others at home.
Get into the groove there, and devour something which will make you forget all about scrolling on your phone all night.
Great American 20th century novels; the shocking story of the Barbary pirates; the ‘she wolves’ of English history; Golden Age detective fiction.
Find your genre or subject, and let it ravish you!
Make the most of the gift of this freedom to amuse yourself, because all too soon you might partner up, and you’ll slash great chunks off such latitude.