97 Ford Explorer starting issue

The other day my 97 Ford Explorer wouldn’t start. Cranked beautifully though. I went and got starter fluid and after an hour she started up and ran fine for 3 days. Until today when I went to start it and came back to have the same starting issues. Fuel pump fuse is fine and brand new fuel filter . Any ideas where to begin

Are there any warning lights that are (or were) lit up advising you to Check Engine or Service Engine Soon, etcetera?

If so this could make figuring things out a little easier.
:evergreen_tree::slightly_smiling_face::evergreen_tree:
CSA

No lights. Gonna test fuel pressure