How to solve technical debt? (angular 5, 2018)

Hi everyone!

I currently have an app where the ionic and angular version stayed behind over the last 2 years.
(Started in 2018, check bellow to see the packages used) (I tried to fix it once before but wasn’t easy )

There are 3 possible pathways to solve the current technical debt:

1. Do nothing. Keep the angular/ionic version behind, and carry this debt on. (seems I can still keep the plugins updated, already updated most of them)
2. Spend 1 maybe 2 weeks trying to upgrade version by version… (already spent yesterday afternoon trying to go from angular 5 to 6 and didn’t finish )(probably will spend today too!)(routes weren’t a thing before! etc)
3. Re-start the ionic project as a new one and re-implement all screens (by copying and pasting of course) and fixing what is no longer compatible with the latest. Not sure how long this will take.

What do you guys think is the best course of action?
P.S. I want/need to solve this technical debt problem because the client wants to make a similar app based on the current one. That means then I will have 2 apps with old dependencies…

package.json:

"scripts": {
	"start": "ionic-app-scripts serve",
	"clean": "ionic-app-scripts clean",
	"build": "ionic-app-scripts build",
	"lint": "ionic-app-scripts lint"
},
"dependencies": {
	"@angular/animations": "5.2.11",
	"@angular/common": "5.2.11",
	"@angular/compiler": "5.2.11",
	"@angular/compiler-cli": "^8.2.13",
	"@angular/core": "5.2.11",
	"@angular/forms": "5.2.11",
	"@angular/http": "5.2.11",
	"@angular/platform-browser": "5.2.11",
	"@angular/platform-browser-dynamic": "5.2.11",
	"@ionic-native/core": "^5.16.0",
	"@ionic-native/in-app-purchase-2": "^5.16.0",
	"@ionic-native/keyboard": "^5.16.0",
	"@ionic-native/market": "^5.16.0",
	"@ionic-native/native-audio": "^5.16.0",
	"@ionic-native/splash-screen": "^5.16.0",
	"@ionic-native/status-bar": "^5.16.0",
	"@ionic-native/vibration": "^5.16.0",
	"@ionic/storage": "^2.2.0",
	"@ngx-translate/core": "^9.1.1",
	"@ngx-translate/http-loader": "^2.0.1",
	"cc.fovea.cordova.purchase": "^8.1.1",
	"cordova-browser": "5.0.4",
	"cordova-ios": "5.0.1",
	"cordova-plugin-device": "^2.0.2",
	"cordova-plugin-ionic-keyboard": "^2.1.3",
	"cordova-plugin-ionic-webview": "^4.0.1",
	"cordova-plugin-market": "^1.2.0",
	"cordova-plugin-nativeaudio": "^3.0.9",
	"cordova-plugin-splashscreen": "^5.0.2",
	"cordova-plugin-vibration": "^3.1.0",
	"cordova-plugin-whitelist": "^1.3.3",
	"cordova-sqlite-storage": "^3.4.0",
	"core-js": "^2.6.5",
	"ionic-angular": "3.9.2",
	"ionicons": "3.0.0",
	"rxjs": "5.5.11",
	"sw-toolbox": "3.6.0",
	"xls-to-json": "^2.1.0",
	"zone.js": "0.8.26"
},
"devDependencies": {
	"@ionic/app-scripts": "^3.2.4",
	"cordova-android": "^9.0.0",
	"typescript": "~4.0.3"
},

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