Look up accounts that post kid activities on instagram. They have tonssssss of stuff you can do for free with stuff from home. Also simple science experiments.
https://www.facebook.com/share/goYNxuNy7Ly9WDAa/?mibextid=LQQJ4d Pinterest is a good place to search. Or the dollar store has simple crafts.
Masking tape is one of my favorite things to use. Here is a good article with lots of ideas to start with. An online search for masking tape ideas will give you tons more. https://www.kidskubby.com/masking-tape-activities-for-toddlers-and-kids/
I bought some hoops and created an indoor obstacle course, throwing bean bags in to the hoop, do a relay with them, blue into blue red into red, toss the hoops onto a bottle etc. kept my son entertained and burnt energy. (£1 for 8 hoops) Workbooks to practice writing. Paint hands left hand yellow, right blue, then mix hands together make green. It’s simple colour mixing but kids still seem to love it. Make a mobile solar system. Rockets from bottles.
If you have a hobby lobby close by I would suggest looking there. They have so many crafts and they are so affordable