I think I can help.
If your goal is to diversify experiences across different classes, create a new toon so you can experience them same time. For dualclass, just grab a class using your same gear - in this case, do archer/archer so you can quickly get to 105 to max obtain dualclass skill.
If you really don't want to spend money on another set of armor, a light armor of your archer, you can pair it with Wynn dualclass for diversified fun. Instead of bow, you just need a 2h magic staff (preferably highly enchant as possible) as Wynn summoner strictly uses that weapon and for transfering p.atk to the summons. For light armor sets, othell or any type of tyrr can also be an option. Tyrr with the latest update as of 04/28/20 recently got one of the biggest BOOST we've seen any class get in ages.
Wynn summoner also can cast magic debuff and marks, so if you really love spamming marks on people's foreheads, get a robe; and with a robe, your double AOE magic debuff and attacks can be useful for crowd control too. If you're going to spend money on a separate robe and staff, might as well create a new character, nowadays you can go 1-85 in 15mins, 85-95 in 2 hours. 95-99 in few more hours and if you're undergeared maybe a whole day. But the point is, by the time you reach lv.101 which you get all the latest skills until level 110, you pretty much have a second character. I suggest you build a 2nd character a buffer ISS at a minimum.
Remember to do Coal Mine (daily 60min instance from the UI interface to the right) everyday until you are Lv.106. It's a gift NC implemented otherwise, new players will take forever to get to lv.106. So through level 105, you can use CM still to boost it until Lv.106. Many quit after Lv.106 because they just can't handle the independent no handicap XP desert where they must party up or build a team to grind upward, 2.5X exponentially XP requirement every level to 110.
So in summary, dualclass generally is for dual class skills so pick whatever that can level the fastest and be done with it so you can focus on your main. If you want diversity of experiences through different play style, NC has made creation of a new char and powerleveling fast very very easy nowadays - so it's worth a shot to look into that route.
Welcome back!