Convert front wheel back to fixed nut
This is achievable, but you're using a big hammer to fix a potentially small problem.

If your wheel has a Quick Release axle like pictured on the right side here


Simply removing the QR Skewer and slapping two nuts on the outside is a recipe for disaster.  There is not enough thread going outside the fork's dropouts to hold a nut.  There's 100mm (4 inches) of axle inside the wheel, and a QR only lets 2-3mm (not a lot) poke out either side.  You need at least as many threads out each side as there are threads in your new wheel nuts.

Another comparison

So you need a complete new front axle, 2x cone nuts, and 2x wheel nuts for the outside.  Its worth replacing the bearings at this time too, because they're cheap and may as well.

There are some slightly-custom tools needed too - picture shows a pair of thin cone spanners, which are only about 2mm thick.  A normal spanner won't fit on the cone nut flats to hold it while adjusting the bearings.

If your axle looks like this then its a Through Axle ("thru axle") and you're on a fairly modern bike.  Reverting to nutted wheel axle will require adapters that are custom to your frame/through axle design, and there are too many variations to explain here.