To find the way is very easy, just further following the Grimsel road upwards. The road passes some tunnels, some you have to ride through, what I found very unpleasant, but there were also some with a bypass for cyclists. But pay attention even at the bypass! I was a bit surprised by suddenly hearing a horn from behind and being overhauled by two Postbusses.
A sightseeing point: the Gelmerbahn, a cablecar with a slope of more than 100% (I didn’t ride it). Next to it the Handeckfallbrücke, a suspension bridge 70 meters above the Aare river (no fee). Then, after a few kilometers, the Räterichsbodensee and the Grimselsee, which is the water reservoir for a powerstation and where at the moment a new dam wall is built, the „Staumauer Spitallamm“. You can visit the construction site, but book the tickets before. You find information for all this here: https://www.grimselwelt.ch/ At the Grimsel pass you find restaurants and hotels to have a break or to stay, what I did.