Purchase yourself a smart trainer like the Wahoo kickr V5. This has been a life changer for me. Stuck in lockdown Australia, with Zwift I can ride when ever I want, and for as long as I want too. I now ride about 50km a day, and am the fittest I've ever been.
You get a great mix of cardio, gamification by playing an actual video game, and social networking as you can chat and make connections to others in the game. All from the comfort of your own home.