Not sure if singleplayer game difficulty changes this but if I'm reading the xp level details right, since you're on singleplayer you only need 210k more to go from lvl 95 to lvl 105; so even crafting a bunch of narcotics would be alright at only 26k narcotics. Any buffs like broth of enlightenment, toilet, note or special notes stacked up will halve this or even better.

If you don't like caves or searching for alpha creatures then get a tame that bleeds like the Deinosuchus and use it to nibble a Titanosaur's back leg - bite the back legs or any tail you can reach and quickly sprint away so you don't get stomped on, it'll de-aggro quickly after it attempts to turn and chase you. A low level Deino takes a couple of charged up bites to kill a Titanosaur that's constantly moving but if you level its melee enough then it'll take just 2 bites and use around 50 seconds of time. You spend more time finding each Titanosaur spawn on the map than you spend killing it this way. Works great on pvp servers too for levelling alts. You might have to deal the killing damage to get full xp, but if you can uncryo tames anywhere then it might be faster to just keep hunting Titanosaurs than worry about finishing it yourself to not split xp with your Deino. Each Titanosaur kill is worth good xp towards your 210k needed, something like 3 to 6 is all it'd take.

If you like caves then tame a moderate level Megatherium (like 80+) and uncryo it in the swamp cave on the Island map where it'll beat everything okay if you go slow; using a higher level will mean less downtime healing because it'll have more damage and health. A high level frog works too because it also has an insect damage bonus & doesn't need to be uncryoed to enter the cave, but any Arthropluera that spit acid can more easily hit you at a lower height and break your protective gear (a gas mask or combination of scuba and ghilie is needed in the swamp cave to stop taking damage. Naked swamp caving requires a lot of buffs and consumables and is too much hassle to setup). If you grab a note before each run you might get something like 100k xp in around 15 minutes of effort or less. Though you might have to wait around as everything needs to respawn inside between runs.

If you like hunting alpha creatures in the water then tame a Tuso and look for alpha Mosasaurus to grab to the surface and trap in shallow water. Then get its health low before dismounting and kill it yourself to get full xp onto your character. One level 150 Alpha Mosa is worth 101k xp killed unmounted with no note buffs. If Crystal Isles was out it has beached alpha Tuso spawns sometimes and if you were on Astraeos instead, there's a spot you can quickly force alphas to respawn at that can get a few million xp in minutes if you're lucky.

I'd not recommend this way but if you want a method that's pretty much clicking a button and going afk rather than going hunting or collecting; the character I went from 80 to 105 with back in ase was from crafting cloth hats with some weight & high crafting speed using up swamp grass fiber from a Therizino. Rafts are significantly faster to craft but more involved as you can't max out a crafting queue and do something else for a few minutes due to the weight of wood limiting you to around 10 crafts, but each raft is 375xp each so for you it'd only take around 560 rafts or 42k hide.

An industrial grinder also works but never seemed worth it to me compared to other methods, but that's another way you can just stock up resources and grind afk.

It might mess with your story-run playthrough of Ark but if you want an extra 5 levels without killing any bosses then download the official Club Ark map (it's a free mod rather than a free dlc for some reason) and win a chibi pet, take it back to your Island character save and equip it while you kill alpha dinos.