You can replace them with lally columns like others have said. You have so many because it’s a wood beam. When you replace them, you will almost definitely need to excavate below the existing slab and pour a new footer (or at a minimum, excavate and inspect the existing footer). I highly recommend Robert Wixson at APAC Engineering — the structural engineer we used on our reno — if you decided to explore this further. An initial site visit will run you a few hundred bucks and be well worth it.